Yeah. It's even mentioned by the researcher in the article.

“Radicalization is not necessarily the main issue among incels. Only a small minority of them actually endorse radical ideas, and an even tinier minority have ever acted out on them,” she said in an interview. “My work has been consistent in that the relationship between ideology and radical action is extremely weak.”
...
Jesse Morton, one of its lead researchers, said he believes most academic research has relied too heavily on the radicalization trajectories of the relatively small number of incels that have carried out acts of violence.
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“Data shows that very few people that hold radical ideologies go on to commit acts of violence and if you stigmatize them, you can actually facilitate greater violence,” Morton said.